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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/tpm/tpm_token_loader.h"
#include <algorithm>
#include "base/bind.h"
#include "base/location.h"
#include "base/sequenced_task_runner.h"
#include "base/single_thread_task_runner.h"
#include "base/sys_info.h"
#include "base/task_runner_util.h"
#include "base/thread_task_runner_handle.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/tpm/tpm_token_info_getter.h"
#include "crypto/nss_util.h"
namespace chromeos {
namespace {
void PostResultToTaskRunner(scoped_refptr<base::SequencedTaskRunner> runner,
const base::Callback<void(bool)>& callback,
bool success) {
runner->PostTask(FROM_HERE, base::Bind(callback, success));
}
} // namespace
static TPMTokenLoader* g_tpm_token_loader = NULL;
// static
void TPMTokenLoader::Initialize() {
CHECK(!g_tpm_token_loader);
g_tpm_token_loader = new TPMTokenLoader(false /*for_test*/);
}
// static
void TPMTokenLoader::InitializeForTest() {
CHECK(!g_tpm_token_loader);
g_tpm_token_loader = new TPMTokenLoader(true /*for_test*/);
}
// static
void TPMTokenLoader::Shutdown() {
CHECK(g_tpm_token_loader);
delete g_tpm_token_loader;
g_tpm_token_loader = NULL;
}
// static
TPMTokenLoader* TPMTokenLoader::Get() {
CHECK(g_tpm_token_loader)
<< "TPMTokenLoader::Get() called before Initialize()";
return g_tpm_token_loader;
}
// static
bool TPMTokenLoader::IsInitialized() {
return g_tpm_token_loader;
}
TPMTokenLoader::TPMTokenLoader(bool for_test)
: initialized_for_test_(for_test),
tpm_token_state_(TPM_STATE_UNKNOWN),
tpm_token_info_getter_(
TPMTokenInfoGetter::CreateForSystemToken(
DBusThreadManager::Get()->GetCryptohomeClient(),
base::ThreadTaskRunnerHandle::Get())),
tpm_token_slot_id_(-1),
can_start_before_login_(false),
weak_factory_(this) {
if (!initialized_for_test_ && LoginState::IsInitialized())
LoginState::Get()->AddObserver(this);
if (initialized_for_test_) {
tpm_token_state_ = TPM_TOKEN_INITIALIZED;
tpm_user_pin_ = "111111";
}
}
void TPMTokenLoader::SetCryptoTaskRunner(
const scoped_refptr<base::SequencedTaskRunner>& crypto_task_runner) {
crypto_task_runner_ = crypto_task_runner;
MaybeStartTokenInitialization();
}
void TPMTokenLoader::EnsureStarted() {
if (can_start_before_login_)
return;
can_start_before_login_ = true;
MaybeStartTokenInitialization();
}
TPMTokenLoader::~TPMTokenLoader() {
if (!initialized_for_test_ && LoginState::IsInitialized())
LoginState::Get()->RemoveObserver(this);
}
TPMTokenLoader::TPMTokenStatus TPMTokenLoader::IsTPMTokenEnabled(
const TPMReadyCallback& callback) {
if (tpm_token_state_ == TPM_TOKEN_INITIALIZED)
return TPM_TOKEN_STATUS_ENABLED;
if (!IsTPMLoadingEnabled() || tpm_token_state_ == TPM_DISABLED)
return TPM_TOKEN_STATUS_DISABLED;
// Status is not known yet.
if (!callback.is_null())
tpm_ready_callback_list_.push_back(callback);
return TPM_TOKEN_STATUS_UNDETERMINED;
}
bool TPMTokenLoader::IsTPMLoadingEnabled() const {
// TPM loading is enabled on non-ChromeOS environments, e.g. when running
// tests on Linux.
// Treat TPM as disabled for guest users since they do not store certs.
return initialized_for_test_ || (base::SysInfo::IsRunningOnChromeOS() &&
!LoginState::Get()->IsGuestSessionUser());
}
void TPMTokenLoader::MaybeStartTokenInitialization() {
CHECK(thread_checker_.CalledOnValidThread());
// This is the entry point to the TPM token initialization process,
// which we should do at most once.
if (tpm_token_state_ != TPM_STATE_UNKNOWN || !crypto_task_runner_.get())
return;
bool start_initialization =
(LoginState::IsInitialized() && LoginState::Get()->IsUserLoggedIn()) ||
can_start_before_login_;
VLOG(1) << "StartTokenInitialization: " << start_initialization;
if (!start_initialization)
return;
if (!IsTPMLoadingEnabled())
tpm_token_state_ = TPM_DISABLED;
ContinueTokenInitialization();
DCHECK_NE(tpm_token_state_, TPM_STATE_UNKNOWN);
}
void TPMTokenLoader::ContinueTokenInitialization() {
CHECK(thread_checker_.CalledOnValidThread());
VLOG(1) << "ContinueTokenInitialization: " << tpm_token_state_;
switch (tpm_token_state_) {
case TPM_STATE_UNKNOWN: {
crypto_task_runner_->PostTaskAndReply(
FROM_HERE,
base::Bind(&crypto::EnableTPMTokenForNSS),
base::Bind(&TPMTokenLoader::OnTPMTokenEnabledForNSS,
weak_factory_.GetWeakPtr()));
tpm_token_state_ = TPM_INITIALIZATION_STARTED;
return;
}
case TPM_INITIALIZATION_STARTED: {
NOTREACHED();
return;
}
case TPM_TOKEN_ENABLED_FOR_NSS: {
tpm_token_info_getter_->Start(
base::Bind(&TPMTokenLoader::OnGotTpmTokenInfo,
weak_factory_.GetWeakPtr()));
return;
}
case TPM_DISABLED: {
// TPM is disabled, so proceed with empty tpm token name.
NotifyTPMTokenReady();
return;
}
case TPM_TOKEN_INFO_RECEIVED: {
crypto_task_runner_->PostTask(
FROM_HERE,
base::Bind(
&crypto::InitializeTPMTokenAndSystemSlot,
tpm_token_slot_id_,
base::Bind(&PostResultToTaskRunner,
base::ThreadTaskRunnerHandle::Get(),
base::Bind(&TPMTokenLoader::OnTPMTokenInitialized,
weak_factory_.GetWeakPtr()))));
return;
}
case TPM_TOKEN_INITIALIZED: {
NotifyTPMTokenReady();
return;
}
}
}
void TPMTokenLoader::OnTPMTokenEnabledForNSS() {
VLOG(1) << "TPMTokenEnabledForNSS";
tpm_token_state_ = TPM_TOKEN_ENABLED_FOR_NSS;
ContinueTokenInitialization();
}
void TPMTokenLoader::OnGotTpmTokenInfo(const TPMTokenInfo& token_info) {
if (!token_info.tpm_is_enabled) {
tpm_token_state_ = TPM_DISABLED;
ContinueTokenInitialization();
return;
}
tpm_token_slot_id_ = token_info.token_slot_id;
tpm_user_pin_ = token_info.user_pin;
tpm_token_state_ = TPM_TOKEN_INFO_RECEIVED;
ContinueTokenInitialization();
}
void TPMTokenLoader::OnTPMTokenInitialized(bool success) {
VLOG(1) << "OnTPMTokenInitialized: " << success;
tpm_token_state_ = success ? TPM_TOKEN_INITIALIZED : TPM_DISABLED;
ContinueTokenInitialization();
}
void TPMTokenLoader::NotifyTPMTokenReady() {
DCHECK(tpm_token_state_ == TPM_DISABLED ||
tpm_token_state_ == TPM_TOKEN_INITIALIZED);
bool tpm_status = tpm_token_state_ == TPM_TOKEN_INITIALIZED;
for (TPMReadyCallbackList::iterator i = tpm_ready_callback_list_.begin();
i != tpm_ready_callback_list_.end();
++i) {
i->Run(tpm_status);
}
tpm_ready_callback_list_.clear();
}
void TPMTokenLoader::LoggedInStateChanged() {
VLOG(1) << "LoggedInStateChanged";
MaybeStartTokenInitialization();
}
} // namespace chromeos
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